After we have a brief overview of the Interface, the most important thing to understanding Unity, and how a unity project works, is to understand the core components to a project. I am calling these core components building blocks.
Unity Building Blocks
Read an overview here: Unity Building Blocks, then look through:
There are some components you will find yourself using all of the time – like Cameras. After you feel like you understand the unity layout and it’s building blocks, but are still thinking “Sure, but how do we make games“, start looking through these overviews of common components.